what were the other sites projected to build a dam for the city of san franciso other than hetch hetchy?

Question

what made hetch hetchy the cheaper option?

Answer 1

Other sites Lake Eleanor

This made hetch hetchy the cheaper option i think: It was underwater.

Hetch Hetchy is more than a recreation destination – it is the home of massive reservoir and the center of a heated political and environmental debate.

The Hetch Hetchy water system was and is a marvel in engineering. Water from the reservoir travels 160 miles in tunnels and pipelines from Yosemite to the San Francisco Bay Area. The system relies entirely on gravity to deliver this water; there are no pumping stations along the way. Overall, the reservoir stores some 117 billion gallons of water and provides the San Francisco Bay Area with 180 million gallons per day. In addition, the purity of the water is such that no filtration is required whatsoever.

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